One thing you should keep in mind that you can use your Netgear extender either as wifi range extender or access point. For using it as an extender, switch on your extender and it should be on extender mode and if you want to use it as access point then it should be on access point mode.
Now to use it as access point you need to go through following steps
How to setup your Netgear Extender as an Access Point?
Connect your Netgear Extender to power and check you should have one solid green light on it.
Connect your Netgear Extender via Ethernet cable to your router.
Connect any wireless device to your Extender network (NETGEAR_EXT).
Open your browser and type in www.mywifiext.net or www.mywifiext.com or 192.168.1.250, it will take you to NETGEAR genie setup page.
it will ask you how would you like to setup your Extender then select access point there.
You will be asked to continue to the Setup Wizard click continue again to connect your extender to your network.
You can now finalize your extender setting means you can set any name and password on it and then hit continue.
New window will open up confirming your settings. Now you can connect your wireless device on your new network available .
All solid lights on your “Netgear Extender” confirm your extender is good to go.